I am a bankruptcy attorney and I would be happy to answer your re-listed question. However, the prior attorney is correct regarding the concern about the vehicle. You must file a motion in order to incur further debt. Additionally, if you incur new car payments, it can change your plan even if it has been confirmed.
You are able to contribute to your 401k and flexible health spending account, via your new job. However, there are some things you should be aware of regarding a change of income in Chapter 13. Since your plan is confirmed, the most important thing is that you are able to continue making your plan payments to the trustee. Make sure that you feel that putting the extra money toward the 401k and health account won't affect your ability to make the monthly payments. Another issue to be aware of is if the trustee feels that your income has significantly changed, they may file a motion to amend your plan for change of circumstances. At any time between confirmation and the last payment, the trustee has the right to modify the plan. For the plan to change, your new income must constitute a "substantial and unanticipated post confirmation change." $3/hour does not appear to be a substantial enough change in your income to warrant the trustee filing a motion to amend your plan, but if you have an attorney you should consult with them regarding any concerns you may have.
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